Axial flow fan and air conditioner having the same

Abstract

The present invention provides an axial flow fan and an air conditioner having the same, wherein the axial flow fan comprises: a driving part, the driving part having a receiving cavity; a fan blade, the fan blade being connected to the cavity wall of the receiving cavity; wherein the driving part is rotatably arranged. The axial flow fan of the present invention solves the problem that the axial flow fan in the prior art is prone to generate noise.

Description

Technical Field

[0001] The present invention relates to the field of fans, and in particular to an axial flow fan and an air conditioner having the same. Background Art

[0002] As people's quality of life continues to improve, the requirements for environmental comfort are getting higher and higher. Air conditioners will inevitably generate noise during operation, and the outdoor unit is particularly likely to become a source of external sound pollution. Because a certain degree of forced heat exchange is required, increasing the air volume becomes the best choice, and the effective and direct way to increase the air volume is to increase the speed of the outdoor fan. The increase in fan speed will directly lead to a deterioration of fan noise.

[0003] During high-speed rotation of traditional axial flow fans, the roots of the blades are subjected to greater forces, so they need to be partially thickened or even reinforced, which increases costs and worsens noise.

[0004] In addition, when traditional axial fans rotate at high speed, the working area of ​​the fan decreases due to the blocking effect of the hub. The airflow near the hub cannot flow out smoothly due to viscosity, and vortices are formed in front and behind the hub, which reduces the air volume, increases the flow resistance loss, and worsens the noise. Summary of the invention

[0005] The main purpose of the present invention is to provide an axial flow fan and an air conditioner having the same, so as to solve the problem that the axial flow fan in the prior art is prone to generate noise.

[0006] To achieve the above objective, according to one aspect of the present invention, an axial flow fan is provided, comprising: a driving part having a containing cavity; and a fan blade connected to a cavity wall of the containing cavity; wherein the driving part is rotatably arranged.

[0007] Furthermore, the accommodating cavity is a through hole, and the fan blade is connected to the hole wall of the through hole.

[0008] Furthermore, there are multiple fan blades, and the multiple fan blades are arranged at intervals along the circumferential direction in the accommodating cavity.

[0009] Furthermore, the fan blade has a blade root portion, which is located at one end of the fan blade away from the cavity wall of the accommodating cavity. A drainage port is provided between each blade root portion of the plurality of fan blades, and the drainage port is a through hole.

[0010] Furthermore, the surface of the blade root facing the drainage port is an arc-shaped surface, and the drainage port is a circular hole.

[0011] Furthermore, a plurality of blade roots are arranged at intervals.

[0012] Furthermore, the fan blade has a blade root and a blade top, the blade root is located at one end of the fan blade away from the cavity wall of the accommodating cavity, and the blade top is located at one end of the fan blade close to the cavity wall of the accommodating cavity; at least part of the blade top is connected to the cavity wall of the accommodating cavity, the length of the part where the blade top is connected to the cavity wall of the accommodating cavity is a, and the projection length of the blade root on the cross section of the fan blade is b, wherein a>b.

[0013] Furthermore, 1.5b≤a≤3.5b.

[0014] Furthermore, the driving part is a circular ring.

[0015] Furthermore, the driving part comprises: a driving section, and the driving section is used to be connected with the power component so that the power component drives the fan blade to rotate through the driving section.

[0016] Furthermore, the driving part further comprises: a connecting section, the connecting section is connected to the driving section, and the accommodating cavity is arranged on the connecting section; wherein the connecting section is a circular ring.

[0017] Furthermore, a limiting portion is provided on the outer surface of the connecting section, and the limiting portion is used to limit the movement of the driving portion.

[0018] Furthermore, the limiting portion is a sliding groove.

[0019] Furthermore, the outer surface of the driving section is provided with transmission teeth.

[0020] According to another aspect of the present invention, an air conditioner is provided, comprising an axial flow fan, wherein the axial flow fan is the above-mentioned axial flow fan.

[0021] The axial flow fan of the present invention can achieve effective air discharge of the axial flow fan through the driving part and the fan blades. Among them, the driving part has a accommodating cavity, the fan blades are connected to the cavity wall of the accommodating cavity, and the driving part is rotatably arranged. During the specific operation of the axial flow fan, the driving part rotates, driving the fan blades to rotate, thereby achieving the air discharge of the axial flow fan. Considering that the fan blades are connected to the cavity wall of the accommodating cavity, that is, the fan blades are connected to the inner wall of the driving part, during the rotation of the fan blades, there is no hub for driving the fan blades to rotate between the fan blades, and no vortex is formed on the fan blades, thereby avoiding the noise caused by the vortex, and solving the problem that the axial flow fan in the prior art is prone to generate noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic structural diagram of an axial flow fan according to an embodiment of the present invention is shown;

[0024] Figure 2 shows a front view of an axial flow fan according to the present invention;

[0025] Figure 3 shows a side view of an axial flow fan according to the present invention;

[0026] Figure 4 A schematic diagram of airflow of an axial flow fan according to the present invention is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Driving unit; 11. Accommodating chamber; 12. Driving section; 121. Transmission tooth; 13. Connecting section; 131. Limiting unit; 20. Fan blade; 21. Blade root; 22. Blade top; 30. Drainage port. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] The present invention provides an axial flow fan, please refer to Figures 1 to 4 The axial flow fan comprises: a driving part 10, the driving part 10 has a containing chamber 11; a fan blade 20, the fan blade 20 is connected to the chamber wall of the containing chamber 11; wherein the driving part 10 is rotatably arranged.

[0033] The axial flow fan of the present invention can achieve effective air discharge of the axial flow fan through the driving part 10 and the fan blades 20. Among them, the driving part 10 has a accommodating chamber 11, the fan blades 20 are connected to the cavity wall of the accommodating chamber 11, and the driving part 10 is rotatably arranged. During the specific operation of the axial flow fan, the driving part 10 rotates, driving the fan blades 20 to rotate, thereby achieving the air discharge of the axial flow fan. Considering that the fan blades 20 are connected to the cavity wall of the accommodating chamber 11, that is, the fan blades 20 are connected to the inner wall of the driving part 10, during the rotation of the fan blades 20, there is no hub for driving the fan blades to rotate between the fan blades 20, and no vortex will be formed on the fan blades 20, thereby avoiding the noise caused by the vortex, and solving the problem that the axial flow fan in the prior art is prone to generate noise.

[0034] In order to ensure that the axial flow fan can discharge air normally, the accommodating cavity 11 is a through hole, and the fan blades 20 are connected to the hole wall of the through hole.

[0035] In this embodiment, the accommodating cavity 11 is set as a through hole, and the fan blade 20 is connected to the hole wall of the through hole, so that under the action of the fan blade 20, the air flow enters the accommodating cavity 11 from one side of the accommodating cavity 11 and is discharged from the other side, ensuring smooth air discharge of the axial flow fan.

[0036] In order to achieve effective air discharge of the axial flow fan, there are multiple fan blades 20 , and the multiple fan blades 20 are arranged at intervals along the circumferential direction in the accommodating cavity 11 .

[0037] In this embodiment, a plurality of fan blades 20 are provided, wherein the plurality of fan blades 20 are arranged at circumferential intervals in the accommodating cavity 11. Under the action of the plurality of fan blades 20, the airflow enters the accommodating cavity 11 from one side of the accommodating cavity 11 and is discharged from the other side, thereby ensuring smooth air discharge of the axial flow fan.

[0038] In this embodiment, optionally, the accommodating cavity 11 is a circular hole or a polygonal hole.

[0039] In order to increase the air volume of the axial flow fan, Figure 1 and Figure 4 As shown, the fan blade 20 has a blade root 21, which is located at one end of the fan blade 20 away from the cavity wall of the accommodating cavity 11. A drainage port 30 is provided between each blade root 21 of the plurality of fan blades 20, and the drainage port 30 is a through hole.

[0040] In this embodiment, the blade root 21 of the fan blade 20 is located at one end of the fan blade 20 away from the cavity wall of the accommodating cavity 11. A flow inlet 30 is provided between each blade root 21 of the plurality of fan blades 20, and the flow inlet 30 is a through hole.

[0041] In this embodiment, the drive unit 10 drives the fan blade 20 to rotate at a high speed by providing the drainage port 30. The fan blade 20 does work on the front and rear airflows during the rotation process, forcing the airflow to move forward at a high speed along the axial direction of the fan blade 20. At the same time, a pressure surface and a suction surface are formed in front and behind the fan blade 20. There is a certain pressure difference between the pressure surface and the suction surface. The airflow in front and behind the work area of ​​the fan blade 20 flows at a high speed. Due to the viscous force of the gas, the airflow in front of the central drainage port 30 in the center of the fan blade 20 is driven to participate in the flow of the surrounding airflow, thereby macroscopically increasing the air volume of the axial flow fan.

[0042] With regard to the specific shape of the blade root 21 , the surface of the blade root 21 facing the drainage port 30 is an arc-shaped surface, and the drainage port 30 is a circular hole.

[0043] In this embodiment, the blade root 21 is the end surface of the fan blade 20 away from the cavity wall of the accommodating cavity 11, and the end surface is an arc surface. The drainage port 30 surrounded by multiple blade roots 21 is a circular hole.

[0044] Preferably, a plurality of blade roots 21 are arranged at intervals.

[0045] In order to ensure that the fan blade 20 is stably connected to the driving unit 10, Figure 1 As shown, the fan blade 20 has a blade root 21 and a blade top 22, the blade root 21 is located at one end of the fan blade 20 away from the cavity wall of the accommodating cavity 11, and the blade top 22 is located at one end of the fan blade 20 close to the cavity wall of the accommodating cavity 11; at least part of the blade top 22 is connected to the cavity wall of the accommodating cavity 11, the length of the part where the blade top 22 is connected to the cavity wall of the accommodating cavity 11 is a, and the projected length of the blade root 21 on the cross section of the fan blade 20 is b, wherein a>b.

[0046] In this embodiment, the fan blade 20 has a blade root 21 and a blade top 22, wherein the blade root 21 is located at one end of the fan blade 20 away from the cavity wall of the accommodating cavity 11, and the blade top 22 is located at one end of the fan blade 20 close to the cavity wall of the accommodating cavity 11, and at least a portion of the blade top 22 is connected to the cavity wall of the accommodating cavity 11.

[0047] In this embodiment, the length of the portion where the top portion 22 of the blade is connected to the wall of the accommodating cavity 11 is a, and the projected length of the root portion 21 of the blade on the cross section of the fan blade 20 is b. In order to ensure a stable connection between the fan blade 20 and the driving unit 10, a>b.

[0048] In the present embodiment, since the fan blade 20 is a cantilever beam-like structure, the deformation of the traditional fan blade has always been a key parameter affecting the strength of the fan blade in the design of the traditional axial flow fan. The fan blade is often thickened due to insufficient strength. In the present embodiment, the arc length of the blade top 22 is longer than the arc length of the blade root. By connecting at least a portion of the blade top 22 to the cavity wall of the accommodating cavity 11, the bending moment will be significantly reduced, and the stress concentration will be reduced, which will improve the stress concentration of the fan blade 20 to a certain extent.

[0049] Preferably, 1.5b≤a≤3.5b.

[0050] Preferably, the driving part 10 is a ring.

[0051] Regarding the specific structure of the driving unit 10, Figure 2 and Figure 3 As shown, the driving unit 10 includes a driving section 12 , and the driving section 12 is used to be connected with a power component so that the power component drives the fan blade 20 to rotate through the driving section 12 .

[0052] In this embodiment, the driving unit 10 includes a driving section 12 , wherein the driving section 12 is used to connect with a power component. During the operation of the axial flow fan, the power component drives the fan blades 20 to rotate through the driving section 12 .

[0053] Preferably, the driving portion 10 further includes: a connecting section 13 , the connecting section 13 is connected to the driving section 12 , and the accommodating chamber 11 is disposed on the connecting section 13 ; wherein the connecting section 13 is a circular ring.

[0054] Considering the positioning problem of axial flow fans during use, such as Figure 2 and Figure 3 As shown, a limiting portion 131 is provided on the outer surface of the connecting section 13 , and the limiting portion 131 is used to limit the movement of the driving portion 10 .

[0055] In this embodiment, a limiting portion 131 is provided on the outer surface of the connecting section 13 , and the limiting portion 131 is used to limit the movement of the driving portion 10 , wherein the limiting portion 131 is used to limit the movement of the driving portion 10 along its axial direction.

[0056] Preferably, the limiting portion 131 is a sliding groove.

[0057] In this embodiment, by setting the limiting portion 131 as a sliding groove, the sliding groove can ensure the normal rotation of the driving portion 10 on the basis of ensuring the limiting.

[0058] Preferably, the outer surface of the driving section 12 is provided with driving teeth 121 .

[0059] The fan drive ring (drive unit 10) of the axial flow fan of the present invention is a cylindrical drive ring with two ends open, and a transmission structure fixed to the drive ring is arranged on the outer periphery to drive the ring to rotate, and the transmission structure is preferably a gear tooth structure. Other positioning devices may also be arranged on the outer periphery of the drive ring, preferably a ball rolling groove structure.

[0060] The fan blade (blade 20) of the axial flow fan of the present invention is a blade of a low-pressure axial flow fan, wherein the blade tip and blade root of the fan blade are both arc-shaped, and the blade tip arc length is greater than the blade root arc length. The blade tip of the fan blade is partially or completely fixed to the inner periphery of the fan drive ring, and the blade grid of the fan blade has a certain installation angle (that is, the fan blade has a certain installation inclination angle relative to the horizontal plane).

[0061] The axial flow fan of the present invention has a central flow opening (flow opening 30) for inducing nearby airflow to participate in the flow of high-speed airflow doing work in the fan blade area, thereby increasing the air volume of the fan.

[0062] The basic working principle of the axial flow fan of the present invention is: when the external drive unit is started, the transmission device on the fan drive ring drives the fan as a whole to rotate at high speed around the fan axis. During the rotation process, the fan blades work on the front and rear airflows, forcing the airflow to advance at high speed along the fan axis. At the same time, pressure surfaces and suction surfaces are formed in front and behind the fan, and there is a certain pressure difference between the pressure surface and the suction surface. The front and rear airflows in the work area of ​​the fan blades flow at high speed. Due to the viscous force of the gas, the airflow in front of the fan central drainage port in the center of the fan is driven to participate in the flow of the surrounding airflow, thereby macroscopically increasing the air volume of the fan.

[0063] At the same time, since the fan is a cantilever beam-like structure, the deformation of traditional fan blades has always been a key parameter affecting the strength of the fan blades in the design of traditional axial flow fans. The fan blades are often thickened due to insufficient strength. By taking advantage of the fact that the arc length of the blade tip is longer than the arc length of the blade root, the blade tip is fixed on the drive ring instead. The bending moment will be significantly reduced, stress concentration will be reduced, and the stress concentration of the fan blades will be improved.

[0064] Drainage principle: During high-speed rotation, the axial flow fan will work on the airflow in front and behind the blades, causing the airflow in front and behind the blades to flow along the axial direction at a relatively high speed (Note: the wind speed of the conventional air conditioner outdoor unit is 4-7m / s). Since there are no direct working components (referring to the blades) in the central drainage port area, a large speed difference is formed between the central drainage port and the blade area. Due to the tangential viscosity of the airflow, the high-speed airflow will drive the surrounding low-speed or even static airflow to participate in the same-direction flow during the flow process. Under this law, the high-speed airflow in the blade area drives the static airflow in the central drainage port area to participate in the same-direction flow through the tangential viscosity, thereby generating a same-direction flow at the central drainage port, which directly increases the overall air volume and work capacity of the fan blade.

[0065] The present invention further provides an air conditioner, comprising an axial flow fan, wherein the axial flow fan is the above-mentioned axial flow fan.

[0066] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0067] The axial flow fan of the present invention can achieve effective air discharge of the axial flow fan through the driving part 10 and the fan blades 20. Among them, the driving part 10 has a accommodating chamber 11, the fan blades 20 are connected to the cavity wall of the accommodating chamber 11, and the driving part 10 is rotatably arranged. During the specific operation of the axial flow fan, the driving part 10 rotates, driving the fan blades 20 to rotate, thereby achieving the air discharge of the axial flow fan. Considering that the fan blades 20 are connected to the cavity wall of the accommodating chamber 11, that is, the fan blades 20 are connected to the inner wall of the driving part 10, during the rotation of the fan blades 20, there is no hub for driving the fan blades to rotate between the fan blades 20, and no vortex will be formed on the fan blades 20, thereby avoiding the noise caused by the vortex, and solving the problem that the axial flow fan in the prior art is prone to generate noise.

[0068] The axial flow fan of the present invention removes the hub of the traditional fan, and turns the original hub area that blocks the airflow into a circulation space, thereby increasing the circulation space during the rotation of the fan. Due to the pressure difference between the pressure surface and the suction surface of the fan blade 20, the airflow is macroscopically in a state of high-speed flow along the axial direction. In the middle-through area without a hub, it will be driven forward in the same direction due to the high-speed flow of the surrounding airflow, forming a drainage effect in a practical sense, thereby increasing the air volume of the fan at the same speed. The fan's driving component is moved from the high-position outer circle of the hub to avoid measures such as forced structural reinforcement and thickening of the hub area due to stress concentration, and the contact length between the outer circle and the fan blade top is 2-3 times that of the blade root, so the stress concentration phenomenon will be significantly improved, which greatly reduces the material consumption of the fan blade 20 and increases the service life of the fan.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0070] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An axial flow fan, characterized in that: include: A driving portion (10), wherein the driving portion (10) has a receiving cavity (11); a fan blade (20), the fan blade (20) being connected to the cavity wall of the accommodating cavity (11); Wherein, the driving part (10) is rotatably arranged; There are a plurality of fan blades (20), and the plurality of fan blades (20) are arranged at intervals along the circumferential direction in the accommodating cavity (11); The fan blade (20) has a blade root (21), the blade root (21) is located at one end of the fan blade (20) away from the cavity wall of the accommodating cavity (11), and a drainage port (30) is provided between each of the blade roots (21) of the plurality of fan blades (20), and the drainage port (30) is a through hole; A plurality of blade roots (21) are arranged at intervals; The fan blade (20) comprises a blade root (21) and a blade top (22), wherein the blade root (21) is located at an end of the fan blade (20) away from the cavity wall of the accommodating cavity (11), and the blade top (22) is located at an end of the fan blade (20) close to the cavity wall of the accommodating cavity (11); at least a portion of the blade top (22) is connected to the cavity wall of the accommodating cavity (11), the length of the portion where the blade top (22) is connected to the cavity wall of the accommodating cavity (11) is a, and the projected length of the blade root (21) on the cross section of the fan blade (20) is b, wherein a>b.

2. The axial flow fan according to claim 1, wherein: The accommodating cavity (11) is a through hole, and the fan blade (20) is connected to the hole wall of the through hole.

3. The axial flow fan according to claim 1, wherein: The surface of the blade root (21) facing the drainage port (30) is an arc-shaped surface, and the drainage port (30) is a circular hole.

4. The axial flow fan according to claim 1, wherein: 1.5b≤a≤3.5b.

5. The axial flow fan according to claim 1, wherein: The driving part (10) is a circular ring.

6. The axial flow fan according to claim 1, wherein: The driving unit (10) includes: A driving section (12) is used to be connected to a power component so that the power component drives the fan blade (20) to rotate through the driving section (12).

7. The axial flow fan according to claim 6, wherein: The driving unit (10) further includes: a connecting section (13), the connecting section (13) being connected to the driving section (12), and the accommodating cavity (11) being arranged on the connecting section (13); Wherein, the connecting section (13) is a circular ring.

8. The axial flow fan according to claim 7, wherein: A limiting portion (131) is provided on the outer surface of the connecting section (13), and the limiting portion (131) is used to limit the movement of the driving portion (10).

9. The axial flow fan according to claim 8, characterized in that The limiting portion (131) is a sliding groove.

10. The axial flow fan according to claim 6, wherein: The outer surface of the driving section (12) is provided with transmission teeth (121).

11. An air conditioner comprising an axial flow fan, characterized in that: The axial flow fan is the axial flow fan according to any one of claims 1 to 10.

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